fix(server): include request URL in RequestInfo

[theamodhshetty]

Summary

• add the full request URL to RequestInfo
• populate it when building HTTP request context for server handlers
• extend the request-info regression test to verify query parameters are preserved

Fixes #1530.

Testing

• pnpm --filter @modelcontextprotocol/node test -- --run -t "should pass request info to tool callback"
• pnpm --filter @modelcontextprotocol/core typecheck && pnpm --filter @modelcontextprotocol/server typecheck && pnpm --filter @modelcontextprotocol/node typecheck
• pnpm --filter @modelcontextprotocol/core lint && pnpm --filter @modelcontextprotocol/server lint && pnpm --filter @modelcontextprotocol/node lint

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commit: 433cf8b